Automatic Focusing Control in Beaconless APT System

Ke, Xizheng; Zhang, Pu

doi:10.1007/s10946-020-09848-y

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…e use of four-quadrant detector (QD) as a system for capturing and tracking detectors does not require additional high-power beacon lasers, beacon transmitting branches, and beacon light receiving detectors. It can minimize the complexity, power consumption, and volume of the system and contribute to the realization of lightweight and miniaturized laser loads [3,4]. e four-quadrant detector studied by the US Naval Research Laboratory [5] can achieve a detection sensitivity of −50 dBm when used in communication reception, and its response is −55 dBm when used in tracking.…”

Section: Introductionmentioning

confidence: 99%

Airborne Laser Communication System with Automated Tracking

Liang

2021

International Journal of Optics

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The acquisition, alignment, and tracking system is an important part of airborne laser communication and is the prerequisite and guarantee for the normal communication link. In order to solve the problem of automatic tracking of laser communication links in the airborne environment, the rapid capture, alignment, and tracking of beams between terminals are realized. This article proposes a stepping motor as a control servo system and a four-quadrant detector as an automatic tracking method for the detection unit. The pulse width modulation signal controls the rotation speed of the stepping motor and combines the position distribution of the light spot on the four-quadrant detector to achieve high-precision beam tracking. On this basis, indoor simulation experiments are carried out. After many experiments, the tracking accuracy is better than 2.5 μrad, which shows that the system can be applied to airborne laser communication, and it is verified that this method has good automatic tracking performance for airborne laser communication.

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Section: Introductionmentioning

confidence: 99%

Airborne Laser Communication System with Automated Tracking

Liang

2021

International Journal of Optics

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Acquisition, Pointing, and Tracking

2024

Handbook of Optical Wireless Communication

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Bidirectional scanning acquisition of inter-satellite laser links for space gravitational wave detection mission

Liu,

Meng

2024

Review of Scientific Instruments

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Space gravitational wave detection requires establishing laser links between distributed spacecraft for interferometry. Inter-satellite laser link acquisition is an essential step in this process. Considering the spacecraft’s miniaturization and reliability, a bidirectional scanning acquisition method is proposed using only field emission electric propulsion and quadrant photodetector. This method does not require additional acquisition sensors and actuators. To improve efficiency while ensuring the acquisition success rate, a constant angular velocity Archimedean spiral scanning guidance law is proposed, and the critical parameters that influence acquisition time and success rate are analyzed. Monte Carlo simulations show that the method can ensure an acquisition success rate of over 90%. Compared with constant linear velocity Archimedean spiral scanning, this method can reduce the acquisition time required to achieve the same success rate by 15%.

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Automatic Focusing Control in Beaconless APT System

Cited by 3 publications

References 16 publications

Airborne Laser Communication System with Automated Tracking

Airborne Laser Communication System with Automated Tracking

Acquisition, Pointing, and Tracking

Bidirectional scanning acquisition of inter-satellite laser links for space gravitational wave detection mission

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